When we try to restore database in SQL Server we get below error and restore database fails

Error

{
——————————
TITLE: Microsoft SQL Server Management Studio
——————————
Cannot show requested dialog.
——————————
ADDITIONAL INFORMATION:
Exception of type ‘System.OutOfMemoryException’ was thrown. (Microsoft.SqlServer.Management.Sdk.Sfc)
——————————
BUTTONS:
OK
——————————
}

Cause
We get above error when we have large number of records on backup history table.
Check the count of rows on below table

select count(1) from msdb.dbo.backupfile   with (nolock)
select count(1) from msdb.dbo.backupfilegroup  with (nolock)
select count(1) from msdb.dbo.restorefile  with (nolock)
select count(1) from msdb.dbo.restorefilegroup with (nolock)
select count(1) from msdb.dbo.restorehistory  with (nolock)
select count(1) from msdb.dbo.backupmediafamily with (nolock)

Resolution
We may have to reduce the number of records in the above tables. We can manually delete records based on date (or) If we do not want backup history we can truncate all the above tables.